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   Data structures that define curves and fields, and
   the mathematical operations on them.
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   Low-level implementation is in <a href="bigint/package-summary.html">bigint</a> for any curve using BigIntegers,
   and in <a href="ed25519/package-summary.html">ed25519</a> for Curve 25519 using Radix $2^{51}$.
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